This could be related to IO scheduling. In the past Unity7 has been guilty of doing IO during graphics operations. So graphics performance was impacted by heavy IO.
I haven't noticed this regression with kernel 4.8 myself. Perhaps because I've been using reasonably efficient SSDs? -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1638278 Title: 4.8 kernel, under heavy load desktop unusable Status in linux package in Ubuntu: Incomplete Bug description: I've updated from Xenial to Yakkety on my Desktop - Sandybridge Macbook Pro 8,1 With Xenial, on 4.4 kernel, doing a compile (with ninja for example), I could use all CPU cores and still have a usable desktop: app switching was relatively quick, I could (slowly) surf the web while the compile was happening. Now with Yakkety 4.8 kernel, doing a compile using all cores totally seizes up my desktop - app switching is incredibly slow, I see redraw errors, mouse has poor response. As a workaround, I have to manually leave a CPU core free when compiling. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.8.0-26-generic 4.8.0-26.28 ProcVersionSignature: Ubuntu 4.8.0-26.28-generic 4.8.0 Uname: Linux 4.8.0-26-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.20.3-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/pcmC0D0p: gerry 4929 F...m pulseaudio /dev/snd/controlC0: gerry 4929 F.... pulseaudio CurrentDesktop: Unity Date: Tue Nov 1 12:02:02 2016 HibernationDevice: RESUME=UUID=2cba34fc-e62e-44c2-904a-1f3f96fbc5eb InstallationDate: Installed on 2016-05-05 (179 days ago) InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) MachineType: Apple Inc. MacBookPro8,1 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-26-generic.efi.signed root=UUID=a9e3a76e-0502-4f4e-a8d9-132fb83f44b1 ro noprompt quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.8.0-26-generic N/A linux-backports-modules-4.8.0-26-generic N/A linux-firmware 1.161 SourcePackage: linux UpgradeStatus: Upgraded to zesty on 2016-10-27 (4 days ago) dmi.bios.date: 10/26/15 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP81.88Z.0047.B2C.1510261540 dmi.board.asset.tag: Base Board Asset Tag# dmi.board.name: Mac-94245B3640C91C81 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro8,1 dmi.chassis.type: 10 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-94245B3640C91C81 dmi.modalias: dmi:bvnAppleInc.:bvrMBP81.88Z.0047.B2C.1510261540:bd10/26/15:svnAppleInc.:pnMacBookPro8,1:pvr1.0:rvnAppleInc.:rnMac-94245B3640C91C81:rvrMacBookPro8,1:cvnAppleInc.:ct10:cvrMac-94245B3640C91C81: dmi.product.name: MacBookPro8,1 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. klp-taint: 12289 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1638278/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
